Plug and Coupler for 2 inch PVC with O-ring groove

I needed a simple prototype of a PVC coupler and plug with threaded fitting and an O-ring. Produced this with Autodesk 360 and printed the prototype on a Bambu Labs P1S. I think the O-ring groove could be a bit deeper to hold the O-ring better, then the inside of the coupler would need to be a bit tighter to make good contact with the O-ring. Also, I should add some kind of grip to the surface of the plug (knurling). The none plug side is for mating with 2-inch PVC. The opening on that side has